vena cerebellum vs vena

vena cerebellum and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena cerebellum	Yes	No	No	No
vena	Yes	No	No	No

As nouns, vena is a hypernym of vena cerebellum; that is, vena is a word with a broader meaning than vena cerebellum:

vena cerebellum: the veins draining the cerebellum
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena cerebellum include vein, venous blood vessel.

vena cerebellum (noun)	vena (noun)
the veins draining the cerebellum	a blood vessel that carries blood from the capillaries toward the heart